so i have a column of time data in the format 061256.76 (which is 6:12 AM and 56.76 sec) which the first two digits are hrs, then min, sec, and milliseconds The time is currently in universal time and needs to be adjusted to local time by subtracting 4 hrs If I subtract four each data point in the column I will get 061254.76 for example which is 6:12 and 54.76 sec but I want 2:12 and 56.76 sec I need to move the hrs back 4 hrs, so I only want to subtract from 04 from the first two digits, any suggestions?

*The numbers above are simply an example, it needs to work for an entire column of time data (in the same format as above)